<template>
	<div>
		<div id="root">
			<div class="todo-container">
				<div class="todo-wrap">
						<top @addTodo="addTodo"/>
						<list :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
						<MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
				</div>
			</div>
		</div>
	</div>
</template>

<script>
	import Top from './components/Top.vue'
	import List from './components/List.vue'
	import MyFooter from './components/MyFooter.vue'
	
	export default {
		name:'App',
		components:{Top,List,MyFooter},
		data() {
			return {
				todos:JSON.parse(localStorage.getItem('todos')) || [{id:'001',title:'欢迎使用TODOList',done:true}]
			}
		},
		methods: {
			//添加一个todo
			addTodo(todoObj) {
				this.todos.unshift(todoObj)
			},
			//勾选or取消勾选一个todo
			checkTodo(id){
				this.todos.forEach((todo)=>{
					if(todo.id === id) todo.done = !todo.done
				})
			},
			//删除一个todo
			deleteTodo(id){
				this.todos = this.todos.filter(todo=>todo.id !== id)
			},
			//全选or取消全选
			checkAllTodo(done){
				this.todos.forEach((todo)=>{
					todo.done = done
				})
			},
			//清除所有已经完成的todo
			clearAllTodo(){
				this.todos = this.todos.filter((todo)=>{
					return !todo.done
				})
			}
		},
		watch: {
			todos:{
				deep:true,
				handler(newValue){
					localStorage.setItem('todos',JSON.stringify(newValue))
				}
			}
		},
	}
</script>

<style>
	body {
			background: #fff;
		}
		.btn {
			display: inline-block;
			padding: 4px 12px;
			margin-bottom: 0;
			font-size: 14px;
			line-height: 20px;
			text-align: center;
			vertical-align: middle;
			cursor: pointer;
			box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
			border-radius: 4px;
		}
		.btn-danger {
			color: #fff;
			background-color: #da4f49;
			border: 1px solid #bd362f;
		}
		.btn-danger:hover {
			color: #fff;
			background-color: #bd362f;
		}
		.btn:focus {
			outline: none;
		}
		.todo-container {
			width: 600px;
			margin: 0 auto;
		}
		.todo-container .todo-wrap {
			padding: 10px;
			border: 1px solid #ddd;
			border-radius: 5px;
		}
</style>